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4150 likes to die on hard acceleration

1609 Views 22 Replies 10 Participants Last post by  406monte
I need some help on my 750 Dp it is a 4150 and i just rebuilt the carb and installed it and it runs really good till i get at around 2500 rpm and then it starts to surge and stutter. I don't know why this is happening i have checked everything i know to check. I starts right up and idles fine. I have checked the floats and they are good and the fule preassure is set at 6 lbs. I have 30cc pumps and 6.5 power valve and 67 primary and 72 sec jets in it. I have 31 primary and 37 sec downleg squirters. I put them in there from the 31's that were in there both front and back. Also, if i am taking off fron a dead stop and hammer it down it takes off really hard then it seems to stumble and act like it is trying to float out on me and i have to peddle it to keep it from dying on me. It has done this to me once yesterday and it tried to die on me once today as well but i kept it going. Any help would be apprecitated i want to take this to the local midnight madness and see if it picked anything up from the old 750 vac sec Holley that i had on it.:confused:

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Are the MABs clear? , if there clogged main metering will be fluffy.

Think i'd go higher on the jetting & go try it (72/78) , is the PV opening? , float heights? , maybe try a 50cc pump in the primaries?

Any fuel filters blocked?
Take the PV out when running on the strip & square jet , i run the 605" on the street so like to use a PV up front , keep jetting up till MPH drops off then go back two#s , pull the plugs & fine tune.
Check float heights & needles/seats , this is why the motors loading up , would be looking @ P float height.
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